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Three-level protection circuit: NTC and TVS
NTC thermistor
Thermistor, as its name suggests, is extremely sensitive to heat and is a kind of variable resistor, mainly divided into PTC and NTC two kinds.
PTC (Positive Temperature Coefficient thermistor), the higher the temperature, the greater the resistance, mainly used in mosquito killers, heaters and other products.
NTC (Negative Temperature Coefficient thermistor) in contrast to PTC, the higher the temperature, the lower the resistance, mainly used as a resistance temperature sensor and current limiting device.
Lithium battery BMS generally use NTC, compared with the product power consumption is small, high accuracy and rapid response, mainly has three functions.
Temperature measurement
Using the characteristics of the resistance, the following three temperature categories can be measured:
Cell temperature: The NTC thermistor is placed between cells to achieve cell temperature measurement, which needs to consider the number of cells covered by each NTC.
Power temperature: The NTC thermistor is placed between the MOS to achieve the measurement of power temperature, and it is necessary to ensure that the NTC is in close contact with the MOS device during installation.
Ambient temperature: Place the NTC thermistor on the BMS board to measure the ambient temperature. The installation position must be far away from the power device.
Temperature compensation
The resistance of most components will increase with the rise of temperature, at this time, NTC needs to be compensated to offset the error caused by temperature.
Inhibit surge current
electrical surge, also known as a surge, is an instantaneous peak that exceeds the stable value, including surge voltage and surge current. The electronic circuit will produce a large surge current when it is turned on, which is easy to cause damage to the components. The use of NTC can prevent this situation and ensure the normal operation of the circuit. For surge protection, TVS is needed.
TVS transient voltage suppressor
TVS (Transient Voltage Suppressors) are transient voltage suppressors, which have high response speed and are suitable for port protection. The specific implementation is as follows:
When abnormally high voltage occurs in the circuit, TVS will quickly adjust the resistance state, release the instantaneous current to the ground, and protect the rear circuit from damage; TVS will recover after the abnormal voltage situation is over.
Home energy storage product series
A lithium battery pack for home energy storage systems, which is compatible with solar panels and the sun The inverter can work together with the power grid to power household appliances, and it can also be used as a For off grid systems.
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